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The Flora of the Sandy Beaches of Southern Africa. Iv. the East Coast Microflora

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The Flora of the Sandy Beaches of Southern Africa. Iv. the East Coast Microflora THE FLORA OF THE SANDY BEACHES OF SOUTHERN AFRICA. IV. THE EAST COAST MICROFLORA. E.E. Campbell and G.C. Bate 1991 REPORT NUMBER 28 Institute for Coastal Research University of Port Elizabeth P.O. Box 1600 Port Elizabeth 6000 REPUBLIC OF SOUTH AFRICA THE FLORA OF THE SANDY BEACHES OF SOUTHERN AFRICA. IV. THE EAST COAST MICROFLORA. E.E. Campbell and G.C. Bate 19<Jl General Editor: Prof. LC. Rust ISBN 0 86988 428 X (Set) ISBN 0 86988 455 7 (Volume) 28 1 TABLE OF CONTENTS 1. INTRODUCTION 2 1.1 The Surf-Zone Ecosystem 2 1.2 The Importance of the Coastline 3 1.3 Past International Research on Surf-Zones 4 1.4 Past Research on the South African Coastline 5 2. MATERIALS AND METHODS 6 2.1 Sites 6 2.2 Environmental Variables 8 2.3 The Slope of the Groundwater Table 8 2.4 Nutrients 9 2.5 Species Composition 9 2.6 Chlorophyll a Concentration 10 2.7 Primary Production 10 3. RESULTS 11 3.1 Environmental Variables 11 3.2 The Slope of the Groundwater Table 11 3.3 Nutrients 11 3.3.1 Phosphate 11 3.3.2 Ammonium 15 3.3.3 Nitrate 15 3.3.4 Silicon 15 3.3.5 Salinity 21 3.4 Species Composition 21 3.4.1 The Species Found in the Water 21 3.4.2 The Species Found in the Foam 24 3.4.3 The Species Found in the Sand 25 3.4.4 Community Analysis 25 3.5 Chlorophyll a Concentration 38 3.6 Primary Production 44 4. DISCUSSION 44 Acknowledgements 49 References 50 APPENDIX 1. INTERNATIONAL LITERATURE LIST 54 APPENDIX 2. LOCAL LITERATURE LIST 58 APPENDIX 3. THE SPECIES COMPOSITION OF SAMPLES COLLECTED ALONG THE EAST COAST OF SOUTH AFRICA 63 2 1. INTRODUCTION 1.1 The Surf-Zone Ecosystem It is a widely held view concerning the phytoplankton of the littoral and inner sublittoral zones of the ocean that high standing stocks only occur in areas having a stable substrate to which benthic plants can attach. Consequently, exposed sandy beaches, where the shifting substratum precludes attachment of macroalgae, have been regarded as zones of low primary production (Brown, 1964). Sandy beaches which do not host phytoplankton accumulations are considered to be "subsidized" to some extent from oceanic and landwater sources (McLachlan, 1980). Those beaches which contain phytoplankton accumulations constitute an exception to this rule (Lewin and Schaefer, 1983). Because of the presence of rich phytoplankton accumulations in the surf, maintained by special cell mechanisms together with water gyres which retain nutrients, McLachlan (1980; McLachlan et al., 1981) proposed that the sand and water envelope of the surf-zone is a viable, semi-closed ecosystem. This ecosystem had the drift line and outer limit of water gyres as its boundaries. Talbot and Bate (1986) took this concept further and reported that no surf diatoms could be found in the nearshore behind the breaker line except on a single occasion, making the system closed at least with respect to surf diatoms. In this report, terminology is used which has developed following investigations at the Sundays River beach surf ecosystem. The surf-zone terminology used by McLachlan, (1980, 1983) and Talbot (1986) has been adapted as follows: The surf-zone ecosystem comprises the entire subaerial beach and the breaker zone. For the purposes of the present study, because the study was undertaken from the beach without the facilities to sample the nearshore, the area of exchange by rip currents is excluded. The ecosystem is considered to be a closed or semi-closed system, the dimensions of which are shown in Figure 1. 200 400 600 800 1 000 Distance from Swashline (m) Figure 1. The dimensions of, and terminology used in describing surf-zones in this report. 3 In the past, the term "bloom" has been used to describe the brown water phenomenon in surf-zones. This has caused some confusion with the result that the following terms are applied strictly in this work: Bloom - High cell concentrations resulting from exponential cell division of a phytoplankton species. Accumulation - High cell concentrations caused by physical concentrating forces, such as water currents. Patch - The discolouration of water due either to bloom formation or accumulating forces. 1.2 The Importance of the Coastline The coastline is a junction between the sea and land, yet it is much more than just a physical meeting. Man has been fascinated by the seashore for millennia and today it forms an important economic entity in the financial structure of all countries bounded by a coastline. Historically, the coast became especially important when international trade expanded with the development of ships capable of negotiating the hazards of the sea and its storms. For this reason, the early importance of the coast was related to the industrial and commercial development of areas with suitable ports. With the increase in the population around the world, the coast, which was previously more important as an industrial and trade area, began to be settled more densely. Many of the people who moved to these areas were no longer directly associated with shipping. This led to the expansion of facilities in these areas which in turn resulted in increased development. With settlement came housing, roads, pollution and a build-up of pressure in an area which, from the point of view of stability, was equated to inland areas. Inexperience in coastal zone management resulted in exceeding the carrying capacity of many of such coastal areas. This, in turn, resulted in an increase in engineering works to keep the coastline stable. Today, the coastline is recognized as a sensitive zone and legislation has been enacted in many parts of the world to enforce suitable strategies for coastal use and management, controlling the dumping of noxious wastes, the use of estuaries as sewer lines and the development of coastal dunefields. The artificial stabilization of wind-blown dunefields has been recognised as having potentially adverse effects at other points along the coast. The abstraction of water from coastal aquifers is no longer seen as merely the use of water which would otherwise flow wastefully into the sea; such water is now recognised as having a role to play in the holistic environment in which Man and all other life-forms exist on earth. 4 Al present much is being writlen about the possibility of an imminent substantial change in the level of the sea - a phenomenon which has indeed been going on since the oceans were formed. All (kvelopments in the coastal zone will be greatly affected by such an event and the ripple-effect will spread to all parts of the world, both physically and economically. An understanding of the impacts of such an occurrence in both the long-term and the short-term is needed. Only with such an understanding will advance planning reduce the impact of the phenomenon. An understanding of the coastal zone does not necessarily follow a purely philosophical consideration of the coast. Such understanding is born out of experience and knowledge following investigation and study. This report supplies information on some aspects of the coastal zone which will extend our understanding of the ecosystem involved and r .iise other questions to spur us on to examine the coast in even greater detail to facilitate future planning. 1.3 Past International Research on Surf-Zones Early reporls on surf-zones containing high concentrations of phytoplankton date from the 1960's (Cassie and Cassie, 1960). There have been other reports since then (Lewin and Norris, 1970; Gunter and Lyles, 1979). In all these early reports the occurrence of brown patches caused by phytoplankton in the water were referred to as "blooms", now known to be accumu1ations (Talbot and Bate, 1987). Accumulations have been reported from all around the world (listed in Campbell, 1987). The phytoplankton which accumulate in surf-zones all belong to one of the following genera: Anaulus, Asterionella, Au/acodiscus or Chactoceros (McLachlan, 1983). The occurrence of overwhelming dominance by a single species in coastal water has also been reported for species of other genera such as Skeleto11ema costatum (Greville) Cleve (Hulburt, 1985) and Ceretau/ina pelagica (Cleve) Hendey, which have both been reported to bloom off the north-east coast of New Zealand (Taylor et al., 1985). The cell concentralions of 103 lo 106 cells r 1 (Hulburt, 1985) measured on these occasions do not approach those 9 1 recorded for accumulating-lypc phytoplankton (10 cells r ; Schaefer and Lewin, 1984; Campbell and B:ite, 1987). A !isl of international literature referring to sandy beach surf-zone phytoplankton is given in Appendix 1. 5 1.4 Past Research on the South African Coastline Research on the South African coastline can be divided into two sections. The nature and ecology of our rocky shore coastline has been studied in great detail by Branch and his group. "The Living Shores of Southern Africa" (Branch and Branch, 1981) is perhaps their best-known publication. With regard to sandy beaches, work began in 1979 when Lewin visited South Africa and initiated studies on the ecology of sandy beaches under the leadership of McLachlan (McLachlan and Lewin, 1981). The botanical work lagged behind until 1982 when, following the initial report of McLachlan and Lewin, (1981) an investigation began into the distribution of phytoplankton accumulations in the surf-zone of the Sundays River beach (Sloff et al., 1984). At this stage the dominant phytoplankter was considered to be A11aulus birostratus (sic), later identified as Anaulus australis sp. nov. Drebes et Schulz. Subsequent lo 1983, detailed work described the phytoplankton ecology, physiology and population dynamics for the Sundays River beach.
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